4/9-1/3=4/9-3/9=19
2/3-1/3=1/3
2/15-1/7=14/105-15/105=-/105
3/7-1/7=2/7
ai thấy đúng thì k nhé mình đang âm
câu 1 là \(\frac{1}{3}\)câu 2 là \(\frac{1}{3}\)
\(\frac{24}{36}-\frac{6}{18}=\frac{12.2}{12.3}-\frac{6}{6.3}=\frac{2}{3}-\frac{1}{3}=\frac{1}{3}\)
\(\frac{18}{27}-\frac{2}{6}=\frac{9.2}{9.3}-\frac{2}{2.3}=\frac{2}{3}-\frac{1}{3}=\frac{1}{3}\)
\(\frac{2}{15}-\frac{5}{35}=\frac{2}{15}-\frac{5}{5.7}=\frac{2}{15}-\frac{1}{7}=\frac{14-15}{15.7}=-\frac{1}{105}\)
\(\frac{15}{25}-\frac{3}{21}=\frac{5.3}{5.5}-\frac{3}{3.7}=\frac{3}{5}-\frac{1}{7}=\frac{21-5}{5.7}=\frac{16}{25}\)
CÂU 1 =\(\frac{1}{3}\) CÂU 2=
CÂU 3 = \(\frac{16}{35}\)